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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Accrued Liabilities, Current [Abstract] |  |
Voluntary Separation Program | $ 65 | $ 65
Profitsharing and savings plans | 72 | 141
Vacation pay | 619 | 516
Health | 171 | 163
Workers compensation | 162 | 133
Property and income taxes | 73 | 63
Interest | 72 | 34
Bonus and incentive pay | 180 | 2,022
Reinsurance payable | 265 | 190
Aircraft maintenance | 122 | 26
Other | 295 | 253
Accrued liabilities | $ 2,096 | $ 3,606

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